Definition

Noun (Medical/Biological term): 1. The absence or imperfect development of an organ or body part, typically present from birth. This refers to a congenital condition where a structure fails to form or develop completely during embryonic growth.

Usage

• The term is used specifically in medical, biological, and anatomical contexts to describe a congenital defect.
• It is a formal, technical term.

Examples

• The ultrasound revealed agenesia of the corpus callosum in the fetus.
• Renal agenesia is a severe condition where a baby is born without one or both kidneys.
• The study focused on the genetic factors contributing to limb agenesia.

Advanced Usage

• The term is often used with a specifying noun to indicate the affected body part (e.g., , ).
• It is synonymous with agenesis, which is the more commonly used form in many medical texts.

Variants and Related Words

• Agenesis (noun): The more frequent variant, identical in meaning to .
• Agenetic (adjective): Relating to or characterized by agenesis (e.g., ).

Synonyms

• Aplasia
• Nondevelopment
• Congenital absence

Antonyms

• Hyperplasia (excessive development)
• Hypertrophy (enlargement)
• Normal development

Noun

1. imperfect development; nondevelopment of a part